Darren Moore asked for a big performance and the players duly responded, dispatching Portsmouth 4-1 at Hillsborough to cement a play-off finish.
Wednesday end the campaign in fourth spot and will go head-to-head with Sunderland in the semi-finals.
Goals from Lee Gregory, Saido Berahino and Jordan Storey in a pulsating first half overturned George Hirst’s opener in front of our highest attendance of the season.
George Byers put the contest to bed late on and Wednesday head into the play-offs bursting with confidence.
Moore’s men turned in a measured and ruthless display, bearing their teeth after suffering an early setback.
With just four minutes on the clock, Michael Jacobs motored down the left flank and pulled back for Hirst, who netted from close range.
But Wednesday soon regained their composure and after turning the screw for a solid 15-minute period drew level.
Marvin Johnson found space down the channel and looked up to pick out the onrushing Gregory, who executed a fine angled finish.
Gregory was at the heart of the next chance, expertly taking a Barry Bannan feed from the sky before bringing a superb save from Gavin Bazunu.
The Portsmouth keeper came to the rescue again on the half-hour mark, acrobatically tipping over a fierce hit inside the box from Bannan.
But Bazunu was powerless to prevent Portsmouth conceding on 36 minutes. Bannan’s chipped cross caused havoc in the danger zone and after a mini-scramble, Berahino controlled and stabbed the ball home.
And still there was more in a dominant first half for the hosts. With three minutes to the break, Byers raced into the area from the right and teed up Storey, who was left with the simple task of clipping into the net from six yards.
The second half was played at a less frantic pace as the Owls managed the game with some aplomb.
Portsmouth struggled to gain possession, pinned in their own half, with Wednesday having seized control.
Byers almost made it 4-1 following a neat Johnson pull-back, Bazunu saving well with his feet.
Both sides then hit the woodwork inside a minute – Aiden O’Brien for Portsmouth and Gregory for the Owls – before Peacock-Farrell thwarted Louis Thompson with a spectacular save.
Callum Paterson came off the bench with five minutes to go and had an immediate impact as the Owls applied the final coating of gloss.
First the Scot forced Bazunu into a flying save and then took the resulting corner for Byers to glance into the top corner and seal an emphatic victory.
Wednesday: Peacock-Farrell, Hunt, Storey, Hutchinson, Palmer, Johnson, Byers, Luongo, Bannan (Paterson 82) Berahino (Windass 75), Gregory (Dele-Bashiru 88)